Commands for the LCR meter is not responding in hyperterminal

Hi,
I would like to communication the lCR meter through hyperterminal. I had set the baud rate as per the LCR -meter but still i Could not communicate.
The command i typed in hyperterminal was COMU?<^END^M> then enter
If the device is on then it will show COMU:ON if not COMU:OFF..but where as here neither of those result was shown ..I could not get what was wrong and didnt respond any thing.
Kindly let me know how to communicate through hyperterminal..
Thanks In advance!

Do you need a modem cable (crossed serial-port cable) or a straight? Are the flow control settings correct? Are you using a USB to serial port device? Those devices are known to be troublesome, if possible i would try with a different type of USB to serial port.